1. The problem statement, all variables and given/known data the base of the great pyramid giza is a square that is 230m on each side. use differentials to estimate the allowable error in the elevation angle that will ensure that the error in calculating the height is at most +,- 5m. phi is the elevation angle of the pyramid. h= height of the pyramid. 2. Relevant equations 3. The attempt at a solution I've tried : h= 115 tan (phi) differentiate h with respect to phi = 115 sec^2 (phi) dh/h= 115sec^2 d phi/ 115tan (phi) and I don't know what to do next .